SQL Performance

DECEMBER 9, 2020

L0 AS ( SELECT 1 AS c. Figure 1: Plan for base CTE cardinality of 2.

C++ 114

C++ Servers Testing Processing 114

SQL Performance

MARCH 10, 2021

BatchMe ( col1 INT NOT NULL , INDEX idx_cs CLUSTERED COLUMNSTORE ) ; And here’s the code with the definition of the dbo.GetNumsAlanCharlieItzikBatch function: CREATE OR ALTER FUNCTION dbo. GetNumsAlanCharlieItzikBatch ( @low AS BIGINT = 1 , @high AS BIGINT ) RETURNS TABLE.

C++ 134

C++ Testing Code Servers 134

SQL Performance

JANUARY 13, 2021

L0 AS ( SELECT 1 AS c. Here’s the function’s definition: CREATE OR ALTER FUNCTION dbo. L0 AS ( SELECT 1 AS c. For this reason, compile times should definitely be taken into account—especially when using the function very frequently with small ranges. This process can have both negative and positive implications.

C++ 113

C++ Code Testing Processing 113

The Netflix TechBlog

OCTOBER 14, 2024

Upon closely examining the user’s Notebook, we noticed a library called pystan , which provides Python bindings to a native C++ library called stan, looked suspicious. Blame The Network The next theory was that the network between the web browser UI (on the laptop) and the JupyterLab server was slow. Specifically, pystan uses asyncio.

Latency 217

Latency Virtualization Traffic Processing 217

Smashing Magazine

AUGUST 9, 2021

It was heralded as an amazing performance revolution, with exciting new features such as server push, parallel streams, and prioritization. We would have been able to stop bundling resources, stop sharding our resources across multiple servers, and heavily streamline the page-loading process. In older versions of TLS (say, version 1.2

Transportation 145

Transportation Internet Internet Network 145

Scalegrid

FEBRUARY 15, 2024

Each section is crafted to elevate your database’s security protocol, from acquiring the necessary SSL certificates to configuring server and client connections. Preparing SSL Certificates for MongoDB The SSL certificates are necessary for our MongoDB server to establish secure SSL/TLS communications.

Servers 130

Servers Best Practices Government Network 130

SQL Performance

MARCH 11, 2020

SQL Server handles NULLs just like non-NULL values for the purpose of enforcing a unique constraint. The standard unique constraint definition is a bit different than the T-SQL version. Suppose that you have a database in a platform that supports the standard unique constraint and you need to migrate that database to SQL Server.

C++ 135

C++ Code Servers Database 135

All Things Distributed

DECEMBER 1, 2016

AWS Batch : Fully- managed batch processing at any scale, with no batch processing software to install or servers to manage. We also added C# support for AWS Lambda. We're excited to see how customers you will put these new features to work. *: Sean Connery is the definitive Bond.

AWS 139

AWS Development Lambda Open Source 139

SQL Performance

APRIL 14, 2021

Here’s the function’s definition: -- Helper dummy table. BatchMe ( col1 INT NOT NULL , INDEX idx_cs CLUSTERED COLUMNSTORE ) ; GO. -- Function definition. b FROM L1 AS A CROSS JOIN L1 AS B CROSS JOIN L1 AS C ) INSERT INTO dbo. Here’s the function’s definition: CREATE OR ALTER FUNCTION dbo. BatchMe ; GO.

C++ 112

C++ Servers Testing Code 112

SQL Performance

APRIL 13, 2022

Note the definition of the primary key constraint based on the composite key (grp, ord), which results in a clustered index based on the same key. L0 AS ( SELECT 1 AS c. My test machine has four logical CPUs, running SQL Server ® 2019 Enterprise. I used a SELECT INTO statement to write the result into a temporary table.

C++ 136

C++ Strategy Testing Servers 136

Smashing Magazine

JULY 18, 2022

If you think that static rendering is limited to generic, public content that is the same for every user of your website, you should definitely read this article. Segmented Rendering is a new pattern for the Jamstack that lets you personalize content statically, without any sort of client-side rendering or per-request Server-Side Rendering.

Cache 118

Cache Website Servers Energy 118

Percona

DECEMBER 29, 2022

The last is a good option when you can afford some downtime and desire to reuse the same server where your current instance is running. You might consider some extra steps, such as verifying the existence of gin/gist indexes, unknown datatypes, or planning the upgrade of any standby server using the rsync approach.

C++ 84

C++ Open Source Database Programming 84

SQL Performance

NOVEMBER 11, 2020

WITH C AS ( SELECT SYSDATETIME ( ) AS dt ) SELECT @i += 1 FROM C WHERE dt = dt ; PRINT @i ; GO. -- Batch 3. WITH C AS ( SELECT SYSDATETIME ( ) AS dt ) SELECT @i += 1 WHERE ( SELECT dt FROM C ) = ( SELECT dt FROM C ) ; PRINT @i ; GO. ) SELECT C1. orderid , C1.

C++ 122

C++ Code Storage Processing 122

SQL Performance

APRIL 8, 2020

As Grant repeatedly points out, many who use common table expressions in T-SQL think that SQL Server persists the inner query result set, and that the reason for this belief is the use of the term table in the construct's name. When I read C. SQL guarantees that the columns will be returned from left-to-right based on definition order.

C++ 143

C++ Database Azure Servers 143

SQL Performance

JUNE 10, 2020

In my coverage of the physical treatment of named table expressions in the series I focus on the treatment in Microsoft SQL Server and Azure SQL Database. Recall that what triggered this series is some confusion that exists in the SQL Server community around named table expressions.

C++ 109

C++ Database Servers Code 109

SQL Performance

MAY 11, 2022

Naturally, if a partitioning or ordering element doesn’t appear in the window function, you omit that part from the index definition. I ran all the examples on SQL Server ® 2019 Developer, where batch-mode on rowstore is available. But what about queries involving multiple window functions with different ordering needs?

C++ 133

C++ Database Servers Code 133

Percona

JULY 5, 2023

Checking server version. For example, you can’t dump and restore user definition: mysql 80 > show create user msandbox_ro@localhostG 1. For example, you can’t dump and restore user definition: mysql 80 > show create user msandbox_ro@localhostG 1. Any changes in system tables made since the 8.0

C++ 123

C++ Database Servers Testing 123

SQL Performance

JULY 13, 2022

L0 AS ( SELECT 1 AS c. But what if you require a deterministic definition of the frame with guaranteed repeatable results? To test the performance of the solutions, you’ll need a larger set of sample data. Orders WITH ( TABLOCK ) ( orderid , orderdate , empid , custid , qty ) SELECT N.

C++ 112

C++ Code Azure Database 112

SQL Performance

NOVEMBER 13, 2019

Never mind the likelihood for this to happen in practice in SQL Server; if I run the query again, theoretically, the row with id 2 could be assigned with row number 3 and the row with id 11 could be assigned with row number 2. Here's the definition of the POC that supports our query: CREATE INDEX idx_grp_data_i_id ON dbo.

Servers 104

Servers C++ Storage Performance 104

SQL Performance

JUNE 10, 2020

In my coverage of the physical treatment of named table expressions in the series I focus on the treatment in Microsoft SQL Server and Azure SQL Database. Recall that what triggered this series is some confusion that exists in the SQL Server community around named table expressions.

C++ 93

C++ Database Servers Code 93

Percona

AUGUST 30, 2023

The most common parameter used by the PostgreSQL server (postmaster) will be PGDATA, which sets the parameter data_directory. Here is an example: $ export PGDATA=/home/postgres/data $ export PGPORT=5434 $ pg_ctl start waiting for server to start.2023-08-04 But changing this is possible only at the server startup.

Database 109

Database Servers Open Source Tuning 109

Alex Podelko

OCTOBER 28, 2016

While protocol-level recording/playback was (and still is) the mainstream approach to testing applications, it is definitely just one type of load testing using only one type of load generation; such equivalency is a serious conceptual mistake, dwarfing load testing and undermining performance engineering in general. LoadRunner) or Java (e.g.

Performance Testing 100

Performance Testing Technology Technology Testing 100

Percona

OCTOBER 17, 2023

The dynamic allocation might have flaws, but it’s definitely a good addition. Shard Key Analyzer helper – analyzeShardKey() The shard key is a critical component of your cluster, as it dictates the distribution of your data through the shards, and that’s where the problem lies. 7001 closed percona> exit /opt/mongo/6.0.6-5/bin/mongod

Metrics 108

Metrics C++ Database Storage 108

Sutter's Mill

JANUARY 11, 2021

C++20 supports two main assertion facilities… For each one, briefly summarize how it works, when it is evaluated, and whether it is possible for the programmer to specify a message to be displayed if the assertion fails. 5] For conditions, it’s up to us to make sure it’s true.) Bonus: [[assert: ?

C++ 80

C++ Programming Code Testing 80

Randon ASCII

OCTOBER 4, 2020

Some programs (WPF, SQL Server, Quartz, PowerDirector, Chrome, the Go Runtime, many games, etc.) At this point if Process C came along and called timeBeginPeriod(4) this wouldn’t change anything – Process A would continue to wake up 500 times a second. That’s crazy! But that’s how Windows has always worked. Implications.

Programming 145

Programming Games Hardware Operating System 145

SQL Performance

DECEMBER 9, 2020

L0 AS ( SELECT 1 AS c. Figure 1: Plan for base CTE cardinality of 2.

C++ 61

C++ Servers Testing Processing 61

HammerDB

FEBRUARY 25, 2021

When we have multiple CPU cores on both the benchmark client and database server it is crucial that these database sessions run independently of each other at the same time, in parallel. For HammerDB both TPROC-C and TPROC-H run all of their workloads on the database being tested in SQL. Database interfaces in C. select top 100.

Programming 68

Programming Benchmarking Virtualization C++ 68

SQL Performance

JULY 27, 2021

Continuing my series of articles on latches, this time I’m going to discuss the DBCC_OBJECT_METADATA latch and show how it can be a major bottleneck for consistency checks prior to SQL Server 2016 under certain circumstances. But remember, this bottleneck only happens for versions of SQL Server earlier than SQL Server 2016.

C++ 54

C++ Servers Database Code 54

Smashing Magazine

NOVEMBER 26, 2021

checks for type definition during build time. Most front-end applications will fetch data from a back-end server and render it on the page. There is an excellent article The Testing Trophy and Testing Classifications by Kent C. In certain cases, the build will fail if there are type mismatches in your code as Next.js

Cache 144

Cache Code Testing Design 144

SQL Performance

APRIL 10, 2019

I posted a suggestion to improve SQL Server by adding support for RPR in T-SQL , but I was quite limited in the space that I had to provide the feedback. price ) AS bottomprice , LAST ( C. LAST ( C. price ) , C AS C. price > PREV ( C. price ) AS bottomprice , LAST ( C.

C++ 73

C++ Servers Virtualization Code 73

SQL Performance

MAY 8, 2019

GetNums ( 1 , 100 ) AS C WHERE C. If you haven’t figured it out yet, look closely at the definitions of both tables—specifically the column names—and at the column names used in the query. Since the reference to custid in the inner query is unqualified, SQL Server has to resolve which table the column is coming from.

Best Practices 68

Best Practices C++ Code Servers 68

SQL Server According to Bob

JANUARY 11, 2020

Using SQLBCP Native/Format File vs Text File and the BOM SQL Server Bulk Copy operations (BCP.exe, OpenRowset BULK, …) have specific abilities depending on the data file format specified. jp_langcheck​​ format ​​ nul​​ - T​​ - S server​​ - w​​ - f langcheck.

C++ 40

C++ Storage Servers Retail 40

Percona

OCTOBER 10, 2023

Your MySQL connection id is 256 Server version: 8.0.32-24.2 Copyright (c) 2009-2023 Percona LLC and/or its affiliates Copyright (c) 2000, 2023, Oracle and/or its affiliates. Type 'c' to clear the current input statement. Type 'c' to clear the current input statement. Commands end with ; or g. drop_triggers:10000:0.25,copy_rows:10000:0.25,swap_tables:10000:0.25,update_foreign_keys:10000:0.25,analyze_table:10000:0.25

Database 102

Database Performance C++ Engineering 102

Percona

DECEMBER 14, 2022

And if the query processes 100 million rows, that’s definitely not trivial! Install the package: note that all the dependent packages, including the Postgres server, will be automatically installed onto your host. Despite its current limitations, there are use cases where this extension can definitely make a difference.

Database 93

Database Storage Analytics Processing 93

Smashing Magazine

SEPTEMBER 6, 2021

Next, we’ll look at how to set up servers and clients (that’s the hard part unless you’re using a content delivery network (CDN)). This difference by itself doesn’t do all that much (it mainly reduces the overhead on the server-side), but it leads to most of the following points. Server Sharding and Connection Coalescing.

Network 108

Network Servers Cache Traffic 108

Dotcom-Montior

MAY 26, 2020

Now let’s analyze that little deeper to understand this definition. . Let’s say there are three functions – a , b and c. Function c is getting called from b and b is getting called from a. It will also show that function c was called by function b , which in turn was called by function a.

Monitoring 54

Monitoring C++ Website Programming 54

Testsigma

FEBRUARY 3, 2021

Dynamic analysis : The applications are executed in real-time and tested for weak spots like authentication/authorisation issues, server issues, data transfer breaches. Example: Authentication process between client and server is processed through the request-response model. Recovery Testing.

Mobile 82

Mobile Testing Hardware C++ 82